Rafter Thrust
Rafter Thrust
(OP)
thread507-189340: wood rafter thrust problem
I may be way off on this one, but the reference thread concludes that there is no thrust if you have a ridge beam.
Isn't the thrust a function of the vertical deflection in the ridge beam?
I may be way off on this one, but the reference thread concludes that there is no thrust if you have a ridge beam.
Isn't the thrust a function of the vertical deflection in the ridge beam?






RE: Rafter Thrust
RE: Rafter Thrust
Yes, slick, rhe horizontal movement or thrust (depending which you are dealing with) is a function of the ridge beam deflection).
Even though the thrust is not required for stability, if you assume a roller support at the eve then you need to detail to allow that movement.
RE: Rafter Thrust
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Rafter Thrust
By my reckoning, to relieve the thrust, the horizontal eaves movement is equal to the ridge deflection at 45deg pitch.
RE: Rafter Thrust
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Rafter Thrust
For a roof slope of 450 it would be equal to the roof deflection. For usual slopes, it would be less and for very steep slopes, it would be more, although the plate action of the roof would tend to hog load from the beam.
BA
RE: Rafter Thrust
RE: Rafter Thrust
If all the force is transferred to the end SW, then there would be no deflection in the ridge beam, which is not going to happen.
Without collar ties at the top plate level of the wall, there will be lateral movement in the wall. There has to be.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Rafter Thrust
BA